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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54ca248d157b90a5f095efde0fb8aa4d486a763334127da7b0199e46db137018' 
  AND token = 'ZbEcihn2ycEaBS5lgtrmB1k/7yHXKLTYN+fLI/YukqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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