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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9267d7a966e40038bc6e9df5aaf297a97a80ad4b3ee8a9591477a5acfcf02a95' 
  AND token = 'uhuH6/59ljduLr7oAl0YAtkkowwli7MtWaFFSz0LcEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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