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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8412ca9f1cea1c9340b82a7079cc8e1bba52febdc968e7e85393ae484e2c3e8d' 
  AND token = 'UDehzyjVjpJd0yJ7kUQsWiFGU7HM9XD+Vo21g2rsD3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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