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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '502812c476aa891d629e8dbfa0ffd97a9d2c41e878fd50f97ecd1dc9b56fc7e1' 
  AND token = 'YZl2fWn857APXyATHjGhpp9akf2GTbH1wt/89WAp6ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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