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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7da498d34bcd6c9e2e3361a52038d64865948c43b1ccb5aa29dffbee2010476c' 
  AND token = 'TCtpF2HhLnxroJ0P4aOuz3bqokd3q9b0tpA935PH66E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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