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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6983e04c3d8c2a4ff1911cabb8d07c264d23ea1005432c71853c5bb529e4617' 
  AND token = 'FvE4zG7ixLv6TG8tFY98Lvn55ALYO9+34GDN4vhXvpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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