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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd741364a5347aad6a34112fd0c939b89851e62ac186434281a4bbfbf639243d' 
  AND token = 'p0TcEwqyGs1odvTsHgJ24MIiePH3HEWCoG5tVmRaLFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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