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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b91ed1db194a776b37413d17985bc25ea0eca5a9dc638556c9a001090d24b34b' 
  AND token = 'jaJyNtcXdwQS8qKd9OwbGZ8nc2VDrdxNpDBpChb4zCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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