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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef0d1355f878f9a88bfe7a372790bd8b89c0fc354ddc4218bb7fa49c14c9de39' 
  AND token = '5Lg9Id12dxDmZx31K/qFjhIuYg8C/S18yqszoC5hJtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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