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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f09f7d4817b74d68cf2c0ba0dbcc6261c22ca0567863dfc1fe33e1b4a9c97628' 
  AND token = 'wGzJmuzceFn0S9dEapeBa984zx2ADoTEl/5/AK3f5QA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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