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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f8ee3a1cf36135236fe81215264e028b63b0c7b0d27d5767968c0549f97ecf0' 
  AND token = 'DjnQXjaPGHxpLriNza4L9QCcMytA7yhpNXh4HUulK0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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