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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c09517418f7ff62e98fb48dd009ec8e5b6a8990231138c454f30c9e3a98a8ba6' 
  AND token = 'y4r8Dp3iAIFHOyjM1ZD5Mkt22aoNLfpxKoMrVzh0c6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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