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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a3f9d88ec4fee87f5d8c3f716a26d0f6182efa101dc5fc31820b5e70ff510ec' 
  AND token = 'gELsqM0mvqtTfiU7CZrvVWeZ+XZjP6yKABG8wrUOxWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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