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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7a65eb107b41ba8c0865a3e4cd1aedb93776268ac6a2563c1f8c217c9eb505d' 
  AND token = 'zdFN6mRX9s+cZdRTsiEpiNHJCTjZyxHGqHw9gk2Lnmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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