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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b24f7baf8aec09c4a461110e7367e48124cc6fe57263fde7244d137401bc8b53' 
  AND token = 'fI0QxbjSl3xOeJe0KDBIDLeSa1jiN14xbXtc0ZPfmG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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