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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1989122cb748a181b7f1b6d77944a0f5c6d2f92218c278e1d752f57c781cc7c8' 
  AND token = 'Tcpp0pKx2QwPxb42m0j9EfP8W2iXDbIpEebPR3Fkhjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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