SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a2faa0771b96f35473818e741a8c3ffb6fbbe4f8b3c9c5cd318ef06c4753711' 
  AND token = 'CzeGsgVrb1AtSFSqcJ+MlhZrM+HOcAU3STw/OkdjJpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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