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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb9e0bce06f8353be9b498a90342b52f2e2e6fd64a42fbf92eb89f6a886a84fc' 
  AND token = 'PEGNFkhHL8lYSn8bjX2P/XQ9IZaQN8CwHlBvf5R8Fp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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