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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe0f34e3ecca9a4dad41002352a37b511c2b5f2e63cbe34d380d3fde26df0bb1' 
  AND token = 'lKrdpjVtmQDJg4hozPhRHjrP6L34S4pV3NVQFxk5eOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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