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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '250bf602a7a2dda16eff6384a204ce1443a86a2044b861a903b9577e2f8e8647' 
  AND token = 's12lgGrEFYIwnTpEL7ok5wmxcni9GAFO/Tkbnk37084=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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