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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74630f74353a4386537feca5d627451231ea5bb405e737080832ab80e8b773b1' 
  AND token = '9/EPJultYWgY8JAa0rRGa58dvKABcZvOSiFM1laSM7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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