SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1b6eb0101b7ebcbb609a91d32536b2478b29ad5f5f2cd0a9362b40600e3b87e' 
  AND token = 'rMovWKRBrfVWqHWS8hj/QUWQy5Q0VvfUS/qbzshgcYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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