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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34d17ed46eeb9de998c85c49d70662c4393cb3df6b0647bb12a034b8b7dcb6e8' 
  AND token = 'QshXJ54n+RvPZh2lyJoKae2CMwNoA79vurmksuv8vIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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