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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c9656eb33bce1a3c54b8fbc090500c8d73707e76c3e92105014609c25bcf567' 
  AND token = 'hf9oYY6a9oqieyj6hCSu24pdMxqcXSt3ItU5VH/+H6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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