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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9edbf607c3f8fb017e51390dd62888dde42695aff0a2cb8b592c73a748d97d5e' 
  AND token = 'uMrAxdggySRF4HWf1E4aItb3yTEmF8CtiQhMHP1UxF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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