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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8010008442018433f831d35bd9d5a3dbcef585f7f88748c3c900b76f5c3d07eb' 
  AND token = '9j7KE/ed4kbH9q0bVdt5HizTpTHghpu0nYkzoPAxIBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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