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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35a6dc0ff6ec36c3e8db14fc9f7aff74a8bb098a7790e0870c41664dd4e2d035' 
  AND token = 'c4Hm+Rhx8lfAhB0OB9TjhMSYGGYJoNUscjEvKC6qdsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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