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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac5fc2fbcbee456660611e9cd65725efa093c95d4998f4cee9e77b86046b16c6' 
  AND token = 'BANM3ViGlV+FHXZHjEikoPtlkkImhi4Iwq5L+PpIBEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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