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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9589b6d03c42e1043e72ed348e8fa3d5a05d9fd4b59d0c4bae1ba4e27221fe5' 
  AND token = 'A68Aa/8pqGiJoAIvNqRVhEo+pATx8+dlYsGtilk436A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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