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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0737dddc5077b464c84d7117dee76a588680d8a76b2f3d0be796702298d747ca' 
  AND token = 'HK3qkDpRsL/bT5Fspkk3QNmAkoRb/fXvF8ZGxhLBK54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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