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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98613366d5790f9cd6f5f1e90887ff1d49d02579b553c935e7a75d9a01f5d652' 
  AND token = 'phg6iZpRPa8kQr1fWPRUs21a/cbRjlFAfCAeKCIp1U4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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