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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9102498720747cd2086095901b66bcea9f2e8a0272c12f2bd1b332f21ab0db09' 
  AND token = 'kPjKVm8XrHqZJc16aJbjWWUjA3W4y5UpBoESADx+J+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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