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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '703fd2f15c32c79a4eff53f3944b8bcf66caa9be7c4f48387d509dca83d22bcf' 
  AND token = '0vYuDMXo1eHtiWxLHT964V9HtlJUwdkMUXQ0xfPVCVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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