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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f3bea45779004f7aa6862e54b6daed6f20ed7b4529bb824609c6503d0449f20' 
  AND token = 'mRm4+ZhIhwqD4bSYetZmccgbXWb057uFwP5uuD3iaRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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