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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2465540fefe3975d6d055d63c4526c15b235dcbe2927d9a1c5ca732d07729da0' 
  AND token = 'Ghhxt0RL0j770dkr5v8Q6Yz9ZiakdsNSpccN48Kj7o4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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