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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd92ee8c250e717e4abb26f80a86248ce7fa7761c9ebc66f159fbf25e09d3365' 
  AND token = 'c4La+D6mPryOgegUfiMUy3Bd8j69QEboNN8FA+i5QRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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