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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22528ff2474d02b261badd1edb1002423d07b1304e1d68881ff9898d7a79db11' 
  AND token = '8eMI9P0yngNtdpc5hI53zbykxmmfXmEJIupbhQc7Uyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00211

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}