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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '641964b9eba37d6641ef30fd8c5b272807175b49f9f19908c5b8f7e9cc584a91' 
  AND token = 'iK0dXurNpwAmUsl6fFl5bjivwaZrtssvs2wd+BpHuys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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