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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28d918134d25ee64edc5f575465568466dd5c2aeb0d13ccf395eb67c9ce4527d' 
  AND token = 'eCWpWfTm5EBnRGLam8pP0Pl8LXPsy2ho5whh96fUenk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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