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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fef3d3fdc881e321d3e4d437a066f8c25c1d2ac995a8d8aa256b52a0c1bfdeef' 
  AND token = 'LbEF6teHJJ9Tn8jvcoUCV5f65MeUAPl9Ur++IiLk35o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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