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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20de7d8816f2c5830f589b54cff449c74a462c385abbc08c3487c0f7e618c54f' 
  AND token = 'Hatb/SdTtDz1OK4/1dbhU7C2wAA2Zc7RP+9VJxkWg9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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