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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a8c46a66a996fa966448184a9d15369eb89ae3569a28cd18197eb01cc36ee78' 
  AND token = 'Ts2WbFcl/Gmc08mOb9jd+ADKcOhEeKtTKSR1B/HtkAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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