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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '065f8f4323a65cb2779c59e75312881d9a51cd5cfcc8116014d4404b162976a9' 
  AND token = 'aVjtYgUR0nOqdYm40dR3ZUerD6vwnYI3acJnJsKLgO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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