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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '881d8e56c99a875b6a1b4df2049b551d13583eb67ca68b99e8307d6c0f7c5f61' 
  AND token = 'IJbczd67KkwryuJqyQIUit97QbiCTC+8/B81wplrUhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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