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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10714b3e366d182518eeadbbd3b7f7ecf58a78ee1709ab17ef8b864597eb011b' 
  AND token = 'LuTmoF7kwVqltY3NuLfSzqPp77PBylxz99g26ntD8BE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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