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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfa39f2b26070a0ed4f9cac0da52e67625abe30ed30cd302c534341f4ad6b27a' 
  AND token = 'Q6CDc9GnhoI7B+qUFHi3u+p6q1KOqM/I4nXpk6VjaS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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