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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7df3d1084e4c26d58e0118cab0499b0b94f39d1ae53e1b8d810efec347aa13d' 
  AND token = 'dQHBgc56FioCloI3PKVTUMKLpG8Z9z9XFup71Ga/AxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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