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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '904654dd14a6ee0702dc4aeef8928a91a7d4599be3abff89c4d91771e2eb0f1c' 
  AND token = 'GNj4E4CVqytGGK2ygwrsHOtkJp1UIfRDUbLdR7ire9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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