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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de4fa4515a79d3a920184a82089711e5df434acffbe636ca093cd47d8b020334' 
  AND token = 'n6QQ02hQhJjhafkVtkVUR1aafjvtdFnLijenh9IlStw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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