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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecb99c35f6490b5aa886576ddf3e4e68735e5bb6a6e880d5834327214ebcd9c1' 
  AND token = 'spoJbbuhqXNK6+3nip0wScWPT0DvIeUKSQrYkHteAKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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