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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a419e9267e278cdfd9c55c4f380a2b14640cdc588d496782f7fff1ca95ee76e' 
  AND token = 'fkDIp17iVkUpgbVLdQBnSzEzZYG34myX5C1RjUDm4lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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