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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74bdfb9cd21af6466685fd0054fa339c97ffe810c8f3fc93dc1f57e00785b673' 
  AND token = 'P2B+noZqUD9wZCpZqQT+fNL4VnZtbDCs4Z3DIf2N+ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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