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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82c8571f7b4ca136a203fd17726eb972a98df52b722446573fa2912ddcc4b730' 
  AND token = 'aWACWehYq1oIdqT8Dv9vQdDbJr9XoPGd/cO9XrvXKh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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