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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8e3a06277bee4b75cffdce8df46606d3515160439e012c8225c7ff9dd4f3086' 
  AND token = 'jGTRHJgq3T5is0lGrTj4h4J7HBXE9AvCwF5FGjst54I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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