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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb4f1f71734c6b7565535c82426fa37575156698751c786eacc70f03120cd159' 
  AND token = 'Kch2rBUo6aEGPLhWgo6XPCzEaB7y/kd3gtBIaGMKAgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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