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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7402ebc28a85bcd7d58ad72f3da700fb5198f2f7cc458af2e1f17d6e46f3ec6b' 
  AND token = 'Tn71XN55roG9ys47vAld6mWH2IZIGHC5gbOkzI/Fbmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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