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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df3d601f08e6de4630710965e2055a228c072b8048847e6e28f73c2c25818b38' 
  AND token = 'U/gUWOTuplz68LcgfGgiL6Y4G+lW6YWU2MkUI209z4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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