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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea9a9890ca19ec0400e62ae2ed9b35272a796e8996c51af47eb40fbbe13e044d' 
  AND token = 'ObEKRUUf3JQF9yr1cxuhPNl7uPXQDY80Kl7Ptapb9jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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